Heartland Osteoporosis Prevention Study

Inclusion Criteria: * Women who are in their first 5 years of menopause * Have a T score between -1 and -2.49 at the femoral neck, total hip, or L1-L4 spine * Be 19 years of age or older * Have their health care provider's permission to enroll in the study. Exclusion Criteria: * Have osteoporosis * Have a 10 yr probability of hip fracture \>3% or major fracture \>20% based on results of the fracture risk assessment (FRAX) tool * Currently take bisphosphonates, estrogen replacement therapy, glucocorticosteroids, or other drugs affecting bone * Currently participate in a resistance training or high impact weight bearing exercise program three or more times weekly * Weigh \>300 lbs * Have abnormal results for the following laboratory tests: serum 25(OH)D; serum creatinine; serum calcium; parathyroid hormone (PTH); thyroid stimulating hormone (TSH). * Have Paget's disease, heart disease, uncontrolled hypertension, renal disease, or other concomitant conditions that prohibit participation in exercises, risedronate therapy, or use of CaD supplements.